14910-I3-U]

DEPARTMENT Of TRANSI'ORTATION Federal Aviation Administration ()/j'I;1 :ONCURR~NCEs ROunNG $YMBQ, 14CFR Par! 39 IDocket No. FAA-2009-+++++; Directorate Identifier 2009-NM-099-AD) RlN 2120-AA64 INmAlSI~!\; 

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## - Airworthjncss Directivesj Boeing Model 767 Airplanes AGENCY: Federal Aviation Administration (FAA), Department ofTransportation ACTION: Notice ofproposed mlemakil1g (NPRrvt). (DOT). 

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## RDl'dIS SUMMARY: The FAA proposes to supersede an existing mrworthiness directive (AD) 1~);p'G j 

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## Fn;:m-liD~ INITIALS/SIG (STA) 1809.5 bulkhead for cracking, and corrective actions ifnecessary. This proposed AD \vould expand the inspection area to include the vertical inner chord at STA 1809.5 This proposed AD results from reported fatigue cracking in the vertical inner chord and the forward outer chord while doing the detailed inspection ofthe horizontal inner chord at STA 1809.5. We are proposing this AD to detect and correct fatigue cracking in the bulkhead structure at STA 1809.5 and the vertical inner chord at STA 1809.5, which

oFederal eRulemaking Portal: Go to http://www.reguJations.l..!.ov. Follow the could result in failure ofthe bulkhead structure for carrying the flight loads ofthe horizontal stabilizer, and consequent loss ofcontrollability ofthe airplane. DATES: We must receive comments on this proposed AD by [iuse-I1date 45 days aner

instructions for submitting comments. date ofpublication in the fEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthe following methods:14910-13-01

DEPARTMENT OF TRANSJ'ORTATION Federal Aviation Administration 14 CFR Part 39 IDockct No. FAA-20M'-+++++; Directorate Identifier 2009-NM-099-ADI RIN 2120-AA64 1'llTJALSlS1G 

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~ NmA!.S/SIG .- AGENCY: Federal Aviation Administration (FAA), Department ofTransportation Airn'orthincss Directives; Boeing Model 767 Airplanes (DOT). 

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## -?,! ~ ACTION: Notice ofproposed rulernaking (NPRM). 

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# < SUMMARY: The FAA proposes to supersede an existing airworthiness directive (AD) IN!nA!.Si~IG that applies to all Boeing Model 767 airplanes. The existing AD CllHently requires repetitive detailed and high frequency eddy cuneot (I-1FEC)inspections oftlle station ktiY-' ~( CST A) 1809.5 bulkhead for cracking, and conective ac1ions ifnecessary. This proposed lrJITlAt5jS1G AD would expand the inspection area to include the Yeliica] inner chord at STA ]S09,5. 

## :;E This proposed AD results from reported fatigue cracking in the vertical inner chord and

# 2f:s::LD 5 the forward outer chord while doing the detailed inspection ofthe horizontal inner chor NITlALSISIG at STA 1809.5. We are proposing this AD to detect and correct fatigue cracking in the DATE bulkhead structure at STA 1809.5 and the vertical ilU1er chord at STA 1809,5, which could result in failure ofthe bulkhead structure lor carrying the night loads ofthe horizontal stabilizer, and consequent loss ofcontrollability ofthe airplane. DATES: We must receive comments on this proposed AD by [insert' date 45 days ailer 

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# i-Z.7'/L ROUTI"G SYMOOl date ofpublication in tbe FEDERAL REGISTER]. ADDRESSES: You may send commen1s by any afthe following methods:
• Federal eRuJemaking Portal: Go 10http://www.reu.ulations.u.ov. Follow the instructions for submitting comments. R'J.LmN(; SYMBOL